Pneumatic action.



No. 895.804; PATENTED AUG. 11, 1908.

H. SGHWESINGER.

PNEUMATIC ACTION. APPLICATION FILED JUNE 26, 1905;

WITWE8SES IWVEWTOR which form a part of this specification.

HENRY SGHWESINGER, OF DETROIT, MICHIGAN.

PNEUMATIC ACTION.

Specification of Letters Patent.

Patented Aug. 11, 1908.

Applicaticn filed June 26, 1905. Serial No. 266,940.-

To all whom it may concern:

Be it known that I, HENRY SoHwEsINeER, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certainnew and useful Improvement in Pneumatic Actions, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying.drawings,

This invention relates to pneumatic actions for piano players, and other musical instruments that use pneumatic action.

It has for its object an improved arrange- -ment and construction of the primary pneumatic with special reference to what is commonly called the bleed-hole, and bleed-patch thereof.

The special purpose of the invention is to produce a structure in which the bleed assage shall be closed during all the time that the primary neumatic is fully inflated, and thus save the eakage of air from the primary,

which occurs in the ordinary and usual construction of that part of the piano player. This full inflation of the primary pneumatic occurs during the time that the music is open, that is, during-the time that the perforated music sheet'is in position over the tracker-board to allow the passage of air through the perforation in the music sheet,

and through the tracker-board.

In the drawing, which is entirely diagrammatic, the primar T pneumatic and its connection withthe tracker-board is indicated. The main bellows. indicated are of two characters, an exhaust or. vacuum bellows E, and a forcing, or blast bellows B.

a isan exhaust equalizer, and b an equalizer for the pressure system. The exhaust bellows draws airirom the chamber in which the power pneumatic 2 is located, and the blast bellows forces air into the interior of said pneumatic, but before reaching it, trav els through several chambers and valve .con-

trolled passages;

The tracker-board is indicated at 3, and from this there'is an air conveying pipe 4, which leads into a passage 5, and the passage 5 leads under a flexible diaphragm 6, which forms the movable or expansible part of the primary pneumatic. A valve with two faces or heads 8 and 9 connected y a'stem 7, controls a passage 12 that communicates bearrangement of the air while the note tween the blast chamber 30 and exhaust chamber 31. The passage 32, which leads to the interior of the power pneumatic 2, is sometimes in communication with the blast chamber 30, and sometimes in communication with the exhaust chamber 31, accordin to the position of the valves 8 and 9. Th

valve 8 extends downward and rests on thq flexible diaphragm 6 of the primary pneumatic, and the valve is lifted by the expan- .sion of the primary pneumatic, which takes place whenever the music sheet A registers with the tracker-board, in position to present an opening through the sheet in register with the opening in the tracker-board. From the passage 5 a branch 10 leads to an opening 13 through the seat against which the face 8 of the valve engages, and the mouth of this opening 13 is so located as to be closed by the valve 8 when the primary pneumatic is fully expanded.

At a convenient point in the branch passage 10 is placed a dia hragm 11 with a small passage 14. The iaphragm provided with the passage constitutes a bleed-patch, which is now so arranged that the passage of air through'it is stopped entirely when the primary pneumatic is fully expanded, and yet opens immediately to perform its duty as a bleed-patch when the perforated sheet A travels to bring the perforation through it out of register with the tracker-board.

c, is a rod resting at one end against the,

power pneumatic 2, so as to be actuated thereby, and at the other end adapted to actuate a bell-crank lever b, which in turn lVith this parts, there is no loss of is playin and on the other hand, there is an immeiate action of the bleed passage as soon-as the note ceases playing. This not,only gives the primary pneumatic a greater strength of action, but it actuates the hammer action e.

also obviates the whistling or hissing noise,"

incident to the passage of air under pressure through the tracker-board.

What I claim is '1. In a pneumatic instrument player, the combination of a primary neumatic, a tracker board, a passage leading from the tracker board to the, pneumatic, a bleed passage and means actuated by the air passing through the first named passage to prevent passage of air through said bleed passage, substantially asdescribed.

2, In a pneumatic instrument playerin 2 see,ao4-

combination, aprimary pneumatic, a tracker I acting to control said power pneumatic, a board, a passage from said tracker board to i bleed passage, said bleed passage opening said primary pneumatic, a branch passage, through sald valve seat, substantially or the means for closing said branch passage upon purpose described.

5 the expansion of the primary )neumatic, and i In testimony whereof, I, sign this specifica- 15 a bleed patch located in said passage, subl tion in the presence of two Witnesses. stantially as described. HENRY SCHWESINGER.

3. In a pneumatic instrument player, the Witnesses: combination of a primary pneumatic, a power MAY E. KOTT,

1 pneumatic, a valve having a valve seat and CHARLES F. BURTON 

